Jennifer Aniston and her fiance Justin Theroux attended the American Cinematheque Awards to honor pal Ben Stiller.The cute couple made it date night when they hit the big gala together at the Beverly Hilton.While Aniston and Theroux skipped doing press, they arrived in matching black-and-white ensembles just before the show started and greeted friends in the ballroom before taking their seats (a glowing Aniston even showed off her ring to pals on her way to their table!).